Wireless charging system and wireless power transmitting device

US20260180371A1Pending Publication Date: 2026-06-25VOLTRAWARE SEMICONDUCTOR CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
VOLTRAWARE SEMICONDUCTOR CO LTD
Filing Date
2025-11-26
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing wireless power transfer (WPT) devices face issues with overheating and hardware damage due to excessive energy transmission caused by foreign objects, and the use of small sensing coils for foreign object detection increases complexity and manufacturing costs.

Method used

A wireless power transmitting device with a coil structure incorporating a capacitor structure that reduces parasitic capacitance and enhances the quality factor, allowing accurate foreign object detection by measuring power transfer value changes without requiring additional sensing coils.

Benefits of technology

The solution enables reliable foreign object detection with a simpler hardware structure and reduced manufacturing costs, while minimizing overheating risks through electromagnetic resonance and foreign object interference.

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Abstract

A wireless power transmitting device comprises a first coil structure and a control circuit. The first coil structure comprises a first circuit board and a plurality of turns of a coil conductor arranged on the first circuit board. The coil conductor comprises at least one first capacitor structure. Linear distance between the first capacitor structure and an output terminal of the coil conductor is shorter than the linear distance between the first capacitor structure and an input terminal of the coil conductor. Position of the first capacitor structure does not overlap with position of the output terminal. The control circuit measures the first coil structure to determine a power transfer value and determine whether a foreign object has entered a power transmission range between the wireless power transmitting device and the receiving device according to the power transfer value.
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